package com.fxd.gateway.filter;

import org.springframework.cloud.gateway.filter.GatewayFilter;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.factory.AbstractNameValueGatewayFilterFactory;
import org.springframework.http.HttpHeaders;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.UUID;

/**
 * @author xudongfu
 * @date 2025/06/18
 */
@Component
public class OnceTokenGatewayFilterFactory extends AbstractNameValueGatewayFilterFactory {

    @Override
    public GatewayFilter apply(NameValueConfig config) {
        return new GatewayFilter() {
            @Override
            public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
                return chain.filter(exchange)
                        .then(Mono.fromRunnable(
                                () -> {
                                    ServerHttpResponse response = exchange.getResponse();
                                    HttpHeaders headers = response.getHeaders();
                                    String value = config.getValue();
                                    if ("uuid".equalsIgnoreCase(value)) {
                                        value = UUID.randomUUID().toString();
                                    } else if ("jwt".equalsIgnoreCase(value)) {
                                        value = "jwt_data";
                                    }
                                    headers.add(config.getName(), value);
                                }
                        ));
            }
        };
    }
}
